This 99-05 Volkswagen Jetta cold air intake is from Injen's original RD line.
Injen has got to be the last true engineers in the intake world. Compare an Injen intake to any other Jetta intake and you can immediately tell that it's not just thicker, but are also shaped different. Unlike the other big names in intakes, Injen does NOT just simply copy your stock intake tube. Injen really cares about performance, so they spend a lot of time to design the absolute best intake for your Jetta.
The RD line of intakes is Injen's classic line of cold airs. They are geared towards cars like the Jetta that are relatively straight forward and don't require the more complicated (and expensive) features of their other intake lines. They are best for creating mid-range power. Also, as a cold air, it sits deeper and further forward in your engine bay in order to pull the "colder" air from outside.

This 99-05 Volkswagen Jetta cold air intake is from Injen's premiere SP line of intakes.
Injen is probably the last true performance intake company left. If you look at an Injen intake, it immediately stands out as being thicker than other intakes. In addition, they tend to be shaped unusually. That's because they don't breeze through R&D to just bring a passable intake to market. They spend a lot of time to create the absolute perfect intake for your Jetta.
The SP Cold Air line of intakes is Injen's premiere intake line. They use MR technology to create a multi-diameter intake that produces optimal power, in a cold air design that pulls colder denser air from outside the engine bay. They also pay special attention to your MAF sensor, tuning their intakes not to give too much or too little air to confuse your Jetta's computer.

Spyder Volkswagen Jetta Black Cold Air Intake System helps to draw more and colder air to your engine than your stock Volkswagen Jetta air box setup. This Spyder Volkswagen Jetta Cold Air Black Intake Kit will give you approximately 5-10 horsepower increase. Your results may vary, but the sound will definitely be more intense. This Spyder Volkswagen Jetta Black Cold Air Intake System comes with aluminum Black intake pipe, high flow washable & reusable stainless steel air filter, high pressure silicon hose and mounting accessories.

Spyder Volkswagen Jetta Polish Cold Air Intake System helps to draw more and colder air to your engine than your stock Volkswagen Jetta air box setup. This Spyder Volkswagen Jetta Cold Air Polish Intake Kit will give you approximately 5-10 horsepower increase. Your results may vary, but the sound will definitely be more intense. This Spyder Volkswagen Jetta Polish Cold Air Intake System comes with aluminum Polish intake pipe, high flow washable & reusable stainless steel air filter, high pressure silicon hose and mounting accessories.

Spyder Volkswagen Jetta Black Cold Air Intake System helps to draw more and colder air to your engine than your stock Volkswagen Jetta air box setup. This Spyder Volkswagen Jetta Cold Air Black Intake Kit will give you approximately 5-10 horsepower increase. Your results may vary, but the sound will definitely be more intense. This Spyder Volkswagen Jetta Black Cold Air Intake System comes with aluminum Black intake pipe, high flow washable & reusable stainless steel air filter, high pressure silicon hose and mounting accessories.

Spyder Volkswagen Jetta Red Cold Air Intake System helps to draw more and colder air to your engine than your stock Volkswagen Jetta air box setup. This Spyder Volkswagen Jetta Cold Air Red Intake Kit will give you approximately 5-10 horsepower increase. Your results may vary, but the sound will definitely be more intense. This Spyder Volkswagen Jetta Red Cold Air Intake System comes with aluminum Red intake pipe, high flow washable & reusable stainless steel air filter, high pressure silicon hose and mounting accessories.

Spyder Volkswagen Jetta Red Cold Air Intake System helps to draw more and colder air to your engine than your stock Volkswagen Jetta air box setup. This Spyder Volkswagen Jetta Cold Air Red Intake Kit will give you approximately 5-10 horsepower increase. Your results may vary, but the sound will definitely be more intense. This Spyder Volkswagen Jetta Red Cold Air Intake System comes with aluminum Red intake pipe, high flow washable & reusable stainless steel air filter, high pressure silicon hose and mounting accessories.

Spyder Volkswagen Jetta Polish Cold Air Intake System helps to draw more and colder air to your engine than your stock Volkswagen Jetta air box setup. This Spyder Volkswagen Jetta Cold Air Polish Intake Kit will give you approximately 5-10 horsepower increase. Your results may vary, but the sound will definitely be more intense. This Spyder Volkswagen Jetta Polish Cold Air Intake System comes with aluminum Polish intake pipe, high flow washable & reusable stainless steel air filter, high pressure silicon hose and mounting accessories.

Spyder Volkswagen Jetta Blue Cold Air Intake System helps to draw more and colder air to your engine than your stock Volkswagen Jetta air box setup. This Spyder Volkswagen Jetta Cold Air Blue Intake Kit will give you approximately 5-10 horsepower increase. Your results may vary, but the sound will definitely be more intense. This Spyder Volkswagen Jetta Blue Cold Air Intake System comes with aluminum Blue intake pipe, high flow washable & reusable stainless steel air filter, high pressure silicon hose and mounting accessories.

Spyder Volkswagen Jetta Blue Cold Air Intake System helps to draw more and colder air to your engine than your stock Volkswagen Jetta air box setup. This Spyder Volkswagen Jetta Cold Air Blue Intake Kit will give you approximately 5-10 horsepower increase. Your results may vary, but the sound will definitely be more intense. This Spyder Volkswagen Jetta Blue Cold Air Intake System comes with aluminum Blue intake pipe, high flow washable & reusable stainless steel air filter, high pressure silicon hose and mounting accessories.

Spyder Volkswagen Jetta Black Cold Air Intake System helps to draw more and colder air to your engine than your stock Volkswagen Jetta air box setup. This Spyder Volkswagen Jetta Cold Air Black Intake Kit will give you approximately 5-10 horsepower increase. Your results may vary, but the sound will definitely be more intense. This Spyder Volkswagen Jetta Black Cold Air Intake System comes with aluminum Black intake pipe, high flow washable & reusable stainless steel air filter, high pressure silicon hose and mounting accessories.

Spyder Volkswagen Jetta Black Cold Air Intake System helps to draw more and colder air to your engine than your stock Volkswagen Jetta air box setup. This Spyder Volkswagen Jetta Cold Air Black Intake Kit will give you approximately 5-10 horsepower increase. Your results may vary, but the sound will definitely be more intense. This Spyder Volkswagen Jetta Black Cold Air Intake System comes with aluminum Black intake pipe, high flow washable & reusable stainless steel air filter, high pressure silicon hose and mounting accessories.

Spyder Volkswagen Jetta Blue Cold Air Intake System helps to draw more and colder air to your engine than your stock Volkswagen Jetta air box setup. This Spyder Volkswagen Jetta Cold Air Blue Intake Kit will give you approximately 5-10 horsepower increase. Your results may vary, but the sound will definitely be more intense. This Spyder Volkswagen Jetta Blue Cold Air Intake System comes with aluminum Blue intake pipe, high flow washable & reusable stainless steel air filter, high pressure silicon hose and mounting accessories.

Spyder Volkswagen Jetta Red Cold Air Intake System helps to draw more and colder air to your engine than your stock Volkswagen Jetta air box setup. This Spyder Volkswagen Jetta Cold Air Red Intake Kit will give you approximately 5-10 horsepower increase. Your results may vary, but the sound will definitely be more intense. This Spyder Volkswagen Jetta Red Cold Air Intake System comes with aluminum Red intake pipe, high flow washable & reusable stainless steel air filter, high pressure silicon hose and mounting accessories.

Spyder Volkswagen Jetta Blue Cold Air Intake System helps to draw more and colder air to your engine than your stock Volkswagen Jetta air box setup. This Spyder Volkswagen Jetta Cold Air Blue Intake Kit will give you approximately 5-10 horsepower increase. Your results may vary, but the sound will definitely be more intense. This Spyder Volkswagen Jetta Blue Cold Air Intake System comes with aluminum Blue intake pipe, high flow washable & reusable stainless steel air filter, high pressure silicon hose and mounting accessories.

Spyder Volkswagen Jetta Polish Cold Air Intake System helps to draw more and colder air to your engine than your stock Volkswagen Jetta air box setup. This Spyder Volkswagen Jetta Cold Air Polish Intake Kit will give you approximately 5-10 horsepower increase. Your results may vary, but the sound will definitely be more intense. This Spyder Volkswagen Jetta Polish Cold Air Intake System comes with aluminum Polish intake pipe, high flow washable & reusable stainless steel air filter, high pressure silicon hose and mounting accessories.

Spyder Volkswagen Jetta Red Cold Air Intake System helps to draw more and colder air to your engine than your stock Volkswagen Jetta air box setup. This Spyder Volkswagen Jetta Cold Air Red Intake Kit will give you approximately 5-10 horsepower increase. Your results may vary, but the sound will definitely be more intense. This Spyder Volkswagen Jetta Red Cold Air Intake System comes with aluminum Red intake pipe, high flow washable & reusable stainless steel air filter, high pressure silicon hose and mounting accessories.

Spyder Volkswagen Jetta Polish Cold Air Intake System helps to draw more and colder air to your engine than your stock Volkswagen Jetta air box setup. This Spyder Volkswagen Jetta Cold Air Polish Intake Kit will give you approximately 5-10 horsepower increase. Your results may vary, but the sound will definitely be more intense. This Spyder Volkswagen Jetta Polish Cold Air Intake System comes with aluminum Polish intake pipe, high flow washable & reusable stainless steel air filter, high pressure silicon hose and mounting accessories.